NCP1421DMR2G-ONSEMI-Price, Stock & Datasheet

NCP1421 is a monolithic micropower high-frequency step-up switching converter IC specially designed for battery- operated hand-held electronic products up to 600 mA loading. It integrates Sync-Rect to improve efficiency and to eliminate the external Schottky Diode. High switching frequency (up to 1.2 MHz) allows for a low profile, small sized inductor and output capacitor to be used. When the device is disabled, the internal conduction path from LX or BAT to OUT is fully blocked and the OUT pin is isolated from the battery. This True-Cutoff function reduces the shutdown current to typically only 50nA. Ring-Killer is also integrated to eliminate the high-frequency ringing in discontinuous conduction mode. In addition to above, Low-Battery Detector, Logic-Controlled Shutdown, Cycle-by Cycle Current Limit and Thermal Shutdown provide value-added features for various battery operated applications. With all these functions ON, the quiescent supply current is typically only 8.5 μA. This device is available in the compact and low Micro8 package.

Application

Personal Digital Assistants (PDA)
Handheld Digital Audio Products
Camcorders and Digital Still Cameras
Handheld Instruments
Conversion from one to two Alkaline, NiMH, NICd Battery Cells to 3.0-5.0V or one Lithium-ion cell to 5.0V

Feature

High Efficiency:
94% for 3.3 V Output at 200 mA from 2.0 V Input
84% for 3.3 V Output at 500 mA from 2.5 V Input
High Switching Frequency, up to 1.2 MHz (Not Hitting Current Limit)
True-Cutoff Function Reduces Device Shutdown Current to typically 50nA
Anti-Ringing Ring-Killer for Discontinuous Conduction Mode
High Accuracy Reference Output, 1.2V 1 1.5%,
can supply 2.5mA Loading Current when V_OUT > 3.3V
Low Quiescent Current of 8.5 µA
Integrated Low-Battery Detector
Open Drain Low -Battery Detector Output
1.0V Startup at No Load Guaranteed
Output Voltage from 1.5V to 5.0V Adjustable
1.5 A Cycle-by-Cycle Current Limit
Multi-function Logic Controlled Shutdown Pin
On Chip Thermal Shutdown with Hysteresis
Output Current up to 600mA at V_IN=2.5V and V_OUT=3.3V
Housed in Space Saving and Low Profile Micro8 package
Pb-Free Package is Available